Improve test coverage for R/module_teal_data.R

[m7pr]

Feature description

Part of #1600

Please improve test coverage for R/module_teal_data.R file, so it is above 80%

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[m7pr]

@copilot @copilot can you run covr::file_coverage to report the coverage for the tested file?

[donyunardi]

I don't see R/module_teal_data.R file anymore. I assumed we moved this somewhere due to our other effort to increase the coverage.

Here's the current state from main:

r$> covr::package_coverage()
Registered S3 method overwritten by 'teal':
  method        from      
  c.teal_slices teal.slice
teal Coverage: 80.98%
R/TealAppDriver.R: 0.00%
R/module_bookmark_manager.R: 45.45%
R/module_teal_lockfile.R: 59.54%
R/after.R: 64.41%
R/reporter_previewer_module.R: 70.73%
R/utils.R: 83.16%
R/module_transform_data.R: 84.76%
R/modules.R: 85.51%
R/module_nested_tabs.R: 86.86%
R/module_teal.R: 90.76%
R/module_teal_reporter.R: 92.62%
R/module_data_summary.R: 95.48%
R/teal_slices.R: 95.83%
R/module_filter_manager.R: 96.67%
R/module_snapshot_manager.R: 96.69%
R/dummy_functions.R: 96.72%
R/decorators-helpers.R: 98.31%
R/checkmate.R: 100.00%
R/include_css_js.R: 100.00%
R/init.R: 100.00%
R/module_filter_data.R: 100.00%
R/module_session_info.R: 100.00%
R/module_source_code.R: 100.00%
R/module_validate_error.R: 100.00%
R/teal_data_module-eval_code.R: 100.00%
R/teal_data_module-within.R: 100.00%
R/teal_data_module.R: 100.00%
R/teal_data_utils.R: 100.00%
R/teal_modifiers.R: 100.00%
R/teal_slices-store.R: 100.00%
R/teal_transform_module.R: 100.00%
R/validate_inputs.R: 100.00%
R/validations.R: 100.00%
R/zzz.R: 100.00%

@m7pr can we close this?